fix(helm): improve --dry-run for helm delete

cmd/helm/delete.go

@@ -2,7 +2,6 @@ package main
 
 import (
 	"errors"
-	"fmt"
 
 	"github.com/kubernetes/helm/pkg/helm"
 	"github.com/spf13/cobra"
@@ -37,13 +36,7 @@ func delRelease(cmd *cobra.Command, args []string) error {
 		return errors.New("command 'delete' requires a release name")
 	}
 
-	// TODO: Handle dry run use case.
-	if deleteDryRun {
-		fmt.Printf("DRY RUN: Deleting %s\n", args[0])
-		return nil
-	}
-
-	_, err := helm.UninstallRelease(args[0])
+	_, err := helm.UninstallRelease(args[0], deleteDryRun)
 	if err != nil {
 		return prettyError(err)
 	}

pkg/helm/helm.go

@@ -66,7 +66,17 @@ func UpdateRelease(name string) (*services.UpdateReleaseResponse, error) {
 }
 
 // UninstallRelease uninstalls a named release and returns the response.
-func UninstallRelease(name string) (*services.UninstallReleaseResponse, error) {
+func UninstallRelease(name string, dryRun bool) (*services.UninstallReleaseResponse, error) {
+
+	if dryRun {
+		// In the dry run case, just see if the release exists.
+		res, err := GetReleaseContent(name)
+		if err != nil {
+			return &services.UninstallReleaseResponse{}, err
+		}
+		return &services.UninstallReleaseResponse{Release: res.Release}, nil
+	}
+
 	u := &services.UninstallReleaseRequest{
 		Name: name,
 	}